Four-cylinder locomotive-engine.



J, www. FUB CYLINDER LGMOTIVE ENGNE.. APPLICATION FILED JULY 24, 1909.

Patented Jan. 3, 191.1.

engines JOHANN STUIVIPF, OF BERLIN, GERMANY.

FOUR-CYLINDER LOCOMOTIVE-ENGINE.

esente.

Specification of Letters Patent.

Patented Jan. 3, i911.

Application letl July 24, 1909. Serial No. 509,311.

- To all 'whom it may concern:

. Be it known that I, JOHANN STUMPF, a subject oftheKing of Prussia, and resident of 33 Kurfrstendamm, Berlin, in the Kingdom of Prussia, Germany, professor, have invented certain new and use ul I'niprovenients in Four- Qylinderl Locomotive- Engines7 of which the following is a speciication'.

rlChis invention relates to a four-cylinder single expansion locomotive engine in which the cylinders are divided into pairs arranged adjacent and parallel and set so as to drive cranks at 180O to one another, for the purpose of obtaining good balancing.

The` objectof the present invention istov effect a simpliiication in the valve gear of such engines. This result is obtained by employing a common admission valve for the opposite ends of the cylinders of a pair and exhaust ports inthe cylinders cont-rolled by the pistons so that lthe engines are what might be called continuous current engines. By continuous current l refer to the constancy in the direction of flow ofthe steam from the inlet to the exhaust. Thus in of this type the steam does not change its direction of flow or return upon its former path in passing from the inlet to the exhaust.

The invention will be more readily understood from the 4following description of the example given in the accompanying drawings.

ln these drawings Figure 1 is an end elevation partly in section of a four-cyl inder locomotive engine according to the present invention, Fig. 2 is a plan in section on the line A--B of Fig. 1; Fig. 3 is a longitudinal section ythrough one cylinder, Fig. 1 is a horizontal section through a steam chest on the line lV-V of Fig. 1; Fig. 5 is a vertical section through the steamrhest on line J3-V of Fig. `1., and: Fig. o is a vertical section on the line VEL-Vl of Figs. 1 and 2- 1n carrying the invention into effect ac-4 cording to the form illustrated the four cylinders are arranged side by side with their axes parallel. The adj/acont cylinders 1 and .2 form one pair and the cylinders 3 ande form another pair. The cranks correspond.- ingto each pair of cylinders are set at `180o to one another. The cylinders 1 and 2 have inlet valves 5 arranged within a casing 6 above the cylinders. steam chest 6 is supplied with preferably superheated steam through a pipe 7 Two admission valves 5 are arranged within the chest 6 as can be seen in` Fig. 2, one'of which is adapted to distribute steam to a compartment 17 and 'the other to a compartment 18. The compartnient 17 is connected with a pipe 9 and y a passage 19 with a pipe 9. The pipe 9 is connected with an inlet port 9" in the rear end of the cylinder- 1 and the ipe 9' with a similar port not shown in the -forward end of the cylinder 2. The compartment 18 is connected with a pipe 8 and by a passage 20 arranged above the passage 19 with a pipe 8. The pipe 8 is also con-V nected with an inlet port not shown at the forward end of the cylinder 1 and the pipe 8 with an inlet port not shown at theV rear end of the cylinder 2. The arrangement is the same for the pair of cylinders 3 and 4. 1t will thus be seen that steam is admitted by one or the other of the valves 5 of each pair of cylinders simultaneously into one end of one-cylinder and the opposite end of the other cylinder of a pair. The exhaust in each cylinder takes place through ports 10 leading to a chamber or chest 11 arranged aroundtlie cylinder. The orts 10 are con trolled in a known manner 1n engines ofthis the piston 17. The valves 5 are operated by a rod 16 which may be reciprocated by means of any suitable admission valve gear for instance the well known'.

`Walchaert valve gear,

For convenience and sim licity 4in construction the two central cy inders 2, 3 are cast in one piece and arranged between the side framesv 15 of the locomotive engine truck, to which the cylinders are fastened .by -langes 12 suitableopenin s being left in the side frames to allow of the passage of the exhaust. The cylinders 2, 3 thus form a lcross stay between the two side frames. l The exhaust chests 11 around the cylinders 13 and a common exhaust pipe 14 lea from the central space 11a to the funnel.

By means of the arrangement described above there is not only a considerablesimplicity in the valve gear obtained but the efliciency of the engines-is" considerably increased owing to the continuous current. In such continuous current engines it is known that a considerable clearance space is necessary and this clearance space is provided partly in Ithe pipes 8 and 9. Intengines of are united through the openings s should be f 1o d possible to em when these cr y takes place the Ahaust ports, pistons in said follows therefore in its return stroke .l0 that 90% of the considerable co rge clearance space clearance space of the vcyliiint renders it pipes 8 and 9 arranged as to above, which This requireme ploy the cross oss pipes are so form part of the clearance s he arrangement describe simplified by th d is further exe fact that the ranged above the cylintherewith. The hus exceedingly ood thatthe debe considerably.

ders and is not cas g of the cyli ill be underst tails vof the device kmay isV intended'espeperheated steam but e employed with satulso especially intended ell as high tempera- The engine illustrated or use with su se may also/b rated steam. lIt/'is/a for high pressure as I'claim:- v

1.'In combination, two st inders arranged side ing an inlet port at it haust ports, pistons arranged to earn engine cyle and each havs end and separate exin said cylinders and overrun and control said exa steam chest-common to said controlled by said m valve and connection from said pocket to di oi' 'the pair of cylinde 2. IIn combination, inders arranged side ing inletports at its echanicallj operated s leading diagonally opposite ends two steam e by side and ends and separate e/X- arranged to overrun 4and contro-l ysaid eX- haust ports, a -stean'i chest common to said cylindersni mechanically operated admission valves in said chest, two pockets on said chest, the admission of steam to which is controlled by said mechanically operated valves, and connections. leading diagonally from each of said pockets to the diagonally opposite ends of the pair of cylinders.

` In combination, two steam engine cylinders arrangedfside by side and each having. inlet ports at yits ends and separate exhaust ports, pistons in said cylinders and arrangedto overrun and control said exhaust ports, a common chamber .into which the exhaust ports of both c linders open, a

steam'chest common to sai cylinders, me-

chanically operated admission valves in said chest, two pockets on said chest the admis- "sion of steam to which is controlled by said mechanically operated valves and connections leadin dlagonall from each of said pockets to -te diagona y opposite ends of the pair of c linders.

4. In combination, two steam engine cyl'- inders arranged side by side and each having inlet ports at its ends and separate exhaust ports, pistons in said cylinders and arranged to overrun and control said eX- haust ports, a steam chest common to said cylinders, two mechanically operated lift valves in said chest, two pockets on said chest the admission of steam to -which is lcontrolled by said lit-valves, and connections leadin diagonally from each of Said pockets to te diagonally opposite ends of the pair of cylinders.

In witness whereof I have hereunto .set my hand in the presence of two witnesses.

JOHANN STUMPF.

Witnesses:

AHERMANN BoUrN,

GOTTFRIED KERKAIN, 

